# MAL-2026-12909: Malicious code in bnpl-blocks-data-schema-generator (npm)


- **Type:** Malicious package
- **Package:** `bnpl-blocks-data-schema-generator` (npm)
- **Published:** 5 Aug 2026

## What is MAL-2026-12909?

MAL-2026-12909 is a malicious package in bnpl-blocks-data-schema-generator, published on 5 Aug 2026. 

### Official description

index.js unconditionally requires _bootstrap.js, which on module load reconstructs Cloudflare Workers subdomains (oob-worker.cf10x-xxx.workers.dev) and *.dl.wel1.ru hosts from split string fragments, fetches a platform-specific executable via https.get with a DNS-TXT fallback that reassembles base64 chunks from numbered subdomains, writes the payload to a temp path under disguised names (e.g. dotnet_diag_*.exe,.cache_*), chmods 0755 on Unix, and spawns it detached via /bin/sh -c or cmd.exe /c start. A second file lib/telemetry.js labelled as a telemetry SDK contains the same write+chmod+spawn primitives (Buffer.from(chunks,'base64'), cp.spawn('/bin/sh',['-c', filePath+' &']), fs['chmod'+'Sync'](extensionPath, 0755)) as a redundant dropper. The behavior fires whenever any consumer require()s the package, giving arbitrary remote code execution on the installer's host.

## What should I do about MAL-2026-12909?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-12909 is a malicious package: bnpl-blocks-data-schema-generator (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-12909/ (Markdown: https://insights.sbomify.com/MAL-2026-12909/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12909

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12909/
Summaries are generated and may contain mistakes; the official description above is the record.